datetime

标签：for   rda   识别   sign   Oday   second   时间   time   pre   

from datetime import datetime

datetime.now()

datetime.datetime(2018, 8, 1, 22, 50, 40, 408121)

‘{dt:%y-%m-%d}‘.format(dt = datetime.now())  # 格式化

‘18-08-01‘

f‘{datetime.now():%Y-%m-%d}‘

‘2018-08-01‘

from datetime import date

d = date(2019,3,3)  # shift +tab

print(d)

2019-03-03

date.today()

datetime.date(2018, 8, 1)

from datetime import time

t = time(2,4)
‘‘‘
Init signature: time(self, /, *args, **kwargs)
Docstring:     
time([hour[, minute[, second[, microsecond[, tzinfo]]]]]) --> a time object
‘‘‘

‘\nInit signature: time(self, /, *args, **kwargs)\nDocstring:     \ntime([hour[, minute[, second[, microsecond[, tzinfo]]]]]) --> a time object\n‘

print(t)

02:04:00

# 时间中的各种运算
from datetime import  timedelta

d = timedelta(days = 1 , hours =4)
print(d)

1 day, 4:00:00

today = date.today()
print(today)

2018-08-01

future = today + d  # 加法
print(future)

2018-08-02

future = today + d * 5  # 乘法
print(future)

2018-08-06

today = date.today()
print(type(today))
today.day
print(today.month)

<class ‘datetime.date‘>
8

count = future - today 
print(count)

5 days, 0:00:00

type(count)

datetime.timedelta

count.days # 间隔多少天

5

# 从时间戳生成datetime
import time
t = time.time()
print(t)

1533135872.8751283

from datetime import datetime
datetime.utcfromtimestamp(t)  

datetime.datetime(2018, 8, 1, 15, 4, 32, 875128)

##############
# 格式化字符串表示时间
# strftime : $-> 1999-12-12 把代码里面的时间对象转换成人类识别的字符串
# strptime: 2000-02-23 -> object 把人类识别的字符串转换成代码里面的对象

from datetime import datetime
dt = datetime(2018,2,3,4)
print(dt)

2018-02-03 04:00:00

dt.strftime(‘%Y-%m-%m %X‘)

‘2018-02-02 04:00:00‘

dt.strftime(‘%A %B %Y‘)

‘Saturday February 2018‘

datetime.strptime(‘Saturday February 2018‘, ‘%A %B %Y‘) # 原路返回

datetime.datetime(2018, 2, 1, 0, 0)

# 下周的星期四是几号
from datetime import datetime
from dateutil.relativedelta import relativedelta
from dateutil.rrule import * # MO TU WE TH FR

d = datetime.now()
print(d)

2018-08-01 23:16:20.587947

print(d + relativedelta(weekday=FR))

2018-08-03 23:16:20.587947

print(d + relativedelta(weekday=FR,weeks= +1))  # 下周五是几号的用法

2018-08-10 23:16:20.587947

print(d + relativedelta(weekday=FR,weeks= -1)) #上周五是几号的用法

2018-07-27 23:16:20.587947

# 过一个月后，是几号
from datetime import date
date(2018,3,23) + relativedelta(months=+1)

datetime.date(2018, 4, 23)

# 过一个月后，是几号
from datetime import date
date(2018,3,3) + relativedelta(months=+2)

datetime.date(2018, 5, 3)

# 过一个月后，是几号
from datetime import date
date(2018,3,3) + relativedelta(months=-10)

datetime.date(2017, 5, 3)

datetime

标签：for   rda   识别   sign   Oday   second   时间   time   pre   

原文地址：http://blog.51cto.com/13118411/2153385